CVE-2026-6735

Description

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, 8.5.* before 8.5.6, due to improper sanitation of user data, it allows an attacker to compose an URL, which will cause the target to execute arbitrary JavaScript code (XSS) on the target's machine when the target is viewing the PHP-FPM status page.

CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS — Exploit Prediction

0.0005

Probability of exploitation

0.14%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
php	php	8.2.0 — 8.2.31
php	php	8.3.0 — 8.3.31
php	php	8.4.0 — 8.4.21
php	php	8.5.0 — 8.5.6

References

Advisories & Patches

https://github.com/php/php-src/security/advisories/GHSA-7qg2-v9fj-4mwv

Exploits

https://github.com/php/php-src/security/advisories/GHSA-7qg2-v9fj-4mwv

Frequently Asked Questions

What is CVE-2026-6735? +

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, 8.5.* before 8.5.6, due to improper sanitation of user data, it allows an attacker to compose an URL, which will cause the target to execute arbitrary JavaScript code (XSS) on the target's machine when the target is viewing the PHP-FPM status page. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2026-6735? +

CVE-2026-6735 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0005, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-6735? +

CVE-2026-6735 affects products from php, specifically: php. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-6735? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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